APF Mark 26 Handheld Electronic Calculator

This compact handheld electronic calculator has ten gray digit keys and a gray decimal key, four blue keys for arithmetic functions, a percentage, equals, and clear entry/clear key, and an M key to shift the keys for arithmetic functions to memory keys. Memory keys made it possible to work with subtotals and stored numbers. A red LED display for eight digits and a decimal point is behind the keyboard. The battery compartment at the top has its cover on the back. There presently is no battery and no adapter.
A stamp above the display window reads: aPF MARK 26. A small silver-colored paper tag on the back reads: aPF Electronics, INC. (/) MODEL No: MARK 26 (/) D.C. 9.0 VOLTS (/) CAUTION: Use only model 710 (/) or 751S adaptor (optional) to (/) operate on A. C. (/) SERIAL NO: J125182 (/) MADE IN JAPAN.
An October, 1975, advertisment in the New York Times indicated that the APF Mark 26 sold for $16.95, with an additional $3.95 for the adapter. In May 1975, an advertisement in the Los Angeles Times listed the APF Mark 26 as selling for $19.95 plus $3.95 for the adapter. Another ad in the same paper that month gave a price of $19.99. A March1976 advertisement gave a regular price of $16.88 and a sale price of $9.95. A January 1976 ad in the Chicago Tribune offered the APF Mark 26 for $14.97.
Chicago Tribune, January 4, 1976, p. 12.
New York Times, October 23, 1975, p. 20.
Los Angeles Times, May 2, 1975, p. B14.
Los Angeles Times, May 28, 1975, p. E18.
Los Angeles Times, March 28, 1976, p. T75.
Currently not on view
Object Name
electronic calculator
date made
ca 1975
APF Electronics
Physical Description
plastic (case; keys; screen material)
paper (tag material)
rubber (feet material)
metal (socket for jack material)
overall: 1 1/4 in x 2 1/2 in x 4 1/2 in; 3.175 cm x 6.35 cm x 11.43 cm
ID Number
catalog number
accession number
Handheld Electronic Calculators
Computers & Business Machines
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of John B. Priser
Additional Media

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